Connected: An Internet Encyclopedia
RFC 1771 - 4. Message Formats

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### 4. Message Formats

This section describes message formats used by BGP.

Messages are sent over a reliable transport protocol connection. A message is processed only after it is entirely received. The maximum message size is 4096 octets. All implementations are required to support this maximum message size. The smallest message that may be sent consists of a BGP header without a data portion, or 19 octets.

4.1 Message Header Format
4.2 OPEN Message Format
4.3 UPDATE Message Format
4.4 KEEPALIVE Message Format
4.5 NOTIFICATION Message Format

Next: 4.1 Message Header Format

Connected: An Internet Encyclopedia
RFC 1771 - 4. Message Formats